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Diffstat (limited to 'src/pack.h')
-rw-r--r-- | src/pack.h | 199 |
1 files changed, 0 insertions, 199 deletions
diff --git a/src/pack.h b/src/pack.h deleted file mode 100644 index bf279c6b6..000000000 --- a/src/pack.h +++ /dev/null @@ -1,199 +0,0 @@ -/* - * Copyright (C) the libgit2 contributors. All rights reserved. - * - * This file is part of libgit2, distributed under the GNU GPL v2 with - * a Linking Exception. For full terms see the included COPYING file. - */ - -#ifndef INCLUDE_pack_h__ -#define INCLUDE_pack_h__ - -#include "common.h" - -#include "git2/oid.h" - -#include "array.h" -#include "map.h" -#include "mwindow.h" -#include "odb.h" -#include "offmap.h" -#include "oidmap.h" -#include "zstream.h" - -/** - * Function type for callbacks from git_pack_foreach_entry_offset. - */ -typedef int git_pack_foreach_entry_offset_cb( - const git_oid *id, - off64_t offset, - void *payload); - -#define GIT_PACK_FILE_MODE 0444 - -#define PACK_SIGNATURE 0x5041434b /* "PACK" */ -#define PACK_VERSION 2 -#define pack_version_ok(v) ((v) == htonl(2) || (v) == htonl(3)) -struct git_pack_header { - uint32_t hdr_signature; - uint32_t hdr_version; - uint32_t hdr_entries; -}; - -/* - * The first four bytes of index formats later than version 1 should - * start with this signature, as all older git binaries would find this - * value illegal and abort reading the file. - * - * This is the case because the number of objects in a packfile - * cannot exceed 1,431,660,000 as every object would need at least - * 3 bytes of data and the overall packfile cannot exceed 4 GiB with - * version 1 of the index file due to the offsets limited to 32 bits. - * Clearly the signature exceeds this maximum. - * - * Very old git binaries will also compare the first 4 bytes to the - * next 4 bytes in the index and abort with a "non-monotonic index" - * error if the second 4 byte word is smaller than the first 4 - * byte word. This would be true in the proposed future index - * format as idx_signature would be greater than idx_version. - */ - -#define PACK_IDX_SIGNATURE 0xff744f63 /* "\377tOc" */ - -struct git_pack_idx_header { - uint32_t idx_signature; - uint32_t idx_version; -}; - -typedef struct git_pack_cache_entry { - size_t last_usage; /* enough? */ - git_atomic32 refcount; - git_rawobj raw; -} git_pack_cache_entry; - -struct pack_chain_elem { - off64_t base_key; - off64_t offset; - size_t size; - git_object_t type; -}; - -typedef git_array_t(struct pack_chain_elem) git_dependency_chain; - -#define GIT_PACK_CACHE_MEMORY_LIMIT 16 * 1024 * 1024 -#define GIT_PACK_CACHE_SIZE_LIMIT 1024 * 1024 /* don't bother caching anything over 1MB */ - -typedef struct { - size_t memory_used; - size_t memory_limit; - size_t use_ctr; - git_mutex lock; - git_offmap *entries; -} git_pack_cache; - -struct git_pack_file { - git_mwindow_file mwf; - git_map index_map; - git_mutex lock; /* protect updates to index_map */ - git_atomic32 refcount; - - uint32_t num_objects; - uint32_t num_bad_objects; - git_oid *bad_object_sha1; /* array of git_oid */ - - int index_version; - git_time_t mtime; - unsigned pack_local:1, pack_keep:1, has_cache:1; - git_oidmap *idx_cache; - git_oid **oids; - - git_pack_cache bases; /* delta base cache */ - - time_t last_freshen; /* last time the packfile was freshened */ - - /* something like ".git/objects/pack/xxxxx.pack" */ - char pack_name[GIT_FLEX_ARRAY]; /* more */ -}; - -/** - * Return the position where an OID (or a prefix) would be inserted within the - * OID Lookup Table of an .idx file. This performs binary search between the lo - * and hi indices. - * - * The stride parameter is provided because .idx files version 1 store the OIDs - * interleaved with the 4-byte file offsets of the objects within the .pack - * file (stride = 24), whereas files with version 2 store them in a contiguous - * flat array (stride = 20). - */ -int git_pack__lookup_sha1(const void *oid_lookup_table, size_t stride, unsigned lo, - unsigned hi, const unsigned char *oid_prefix); - -struct git_pack_entry { - off64_t offset; - git_oid sha1; - struct git_pack_file *p; -}; - -typedef struct git_packfile_stream { - off64_t curpos; - int done; - git_zstream zstream; - struct git_pack_file *p; - git_mwindow *mw; -} git_packfile_stream; - -int git_packfile__object_header(size_t *out, unsigned char *hdr, size_t size, git_object_t type); - -int git_packfile__name(char **out, const char *path); - -int git_packfile_unpack_header( - size_t *size_p, - git_object_t *type_p, - struct git_pack_file *p, - git_mwindow **w_curs, - off64_t *curpos); - -int git_packfile_resolve_header( - size_t *size_p, - git_object_t *type_p, - struct git_pack_file *p, - off64_t offset); - -int git_packfile_unpack(git_rawobj *obj, struct git_pack_file *p, off64_t *obj_offset); - -int git_packfile_stream_open(git_packfile_stream *obj, struct git_pack_file *p, off64_t curpos); -ssize_t git_packfile_stream_read(git_packfile_stream *obj, void *buffer, size_t len); -void git_packfile_stream_dispose(git_packfile_stream *obj); - -int get_delta_base( - off64_t *delta_base_out, - struct git_pack_file *p, - git_mwindow **w_curs, - off64_t *curpos, - git_object_t type, - off64_t delta_obj_offset); - -void git_packfile_free(struct git_pack_file *p, bool unlink_packfile); -int git_packfile_alloc(struct git_pack_file **pack_out, const char *path); - -int git_pack_entry_find( - struct git_pack_entry *e, - struct git_pack_file *p, - const git_oid *short_oid, - size_t len); -int git_pack_foreach_entry( - struct git_pack_file *p, - git_odb_foreach_cb cb, - void *data); -/** - * Similar to git_pack_foreach_entry, but: - * - It also provides the offset of the object within the - * packfile. - * - It does not sort the objects in any order. - * - It retains the lock while invoking the callback. - */ -int git_pack_foreach_entry_offset( - struct git_pack_file *p, - git_pack_foreach_entry_offset_cb cb, - void *data); - -#endif |